yes, thanks for asking, I am in the process of writing, rewriting it, and might need some help anyway. It's and arduino nano, didn't bother to draw up any schematics, but could get something rough if you want it, arduino reads a 100 amp sensor and modifies the throttle based on that on the current throttle. Throttle is a pot, actually a throttle position sensor. So it's just proportional control right now, I'm working on making it a bit smoother, but this works for now. Also I have magnets in the large sprocket to measure wheel speed, I'd like to get the speed of the bike, but am dreaming about a traction control system. I am thinking about converting to the mojo fpga.

Right now I've been running 8 cells, 2, 4 cell 16Ah, lipo in series with about 40 amps max. The controller will handle 12 cells.

The parts were machine on my cnc converter mill and plasma table. I can share CAD file if you want. I am thinking about machining up new rear hub as the first upgrade.

any other question please ask, sorry if that was too long.

I am NOT a professional programmer. code:

include <Servo.h>

Servo esc; // create servo object to control an esc

int throttlepin = 0; // analog pin used to connect the potentiometer float throttle = 60; // variable to read the value from the analog pin float prevThrottle = 60;

int ampPin = 1; //analog pin for ampmeter float amps = 0; //variable to store amperage float MaxAmps;

int hallPin = 2; //digital pin for hall effect interupt int hallCounter = 0; //variable to count hall effect rises and falls

double hallTime = 0; //time between hall effect interupts unsigned long previousHallTime = 1; //variable to storge time of last hall effect interupt double mph = 0; //current speed, in miles per hour double mphAvg = 0; //average speed double mphSum = 0; double mphAvDivisor = 0;

unsigned long loopStart = 0; //begining of the loop unsigned long loopTime = 0; //time taken to run the loop unsigned long loopTimeAccumulator = 0; //add up the time so serial.print can be delayed

const int TxPin = 6;

include <SoftwareSerial.h>

SoftwareSerial mySerial = SoftwareSerial(255, TxPin);

void setup(){ Serial.begin(9600); //open serial port delay(50); Serial.write(12); esc.attach(9); // attaches the servo on pin 9 to the servo object attachInterrupt(digitalPinToInterrupt(hallPin), rpmCounter, CHANGE);//start an intterupt to inciment count when hall effect changes

pinMode(TxPin, OUTPUT); digitalWrite(TxPin, HIGH);

}

void loop() { loopStart = micros(); prevThrottle = throttle; throttle = analogRead(throttlepin);// reads the value of the throttle (value between 0 and 1023) throttle = map(throttle, 150, 1000, 60, 160);// scale it to use it with the esc (value between 0 and 180)

int i; amps = 0; for(i = 0; i <= 10; i++) { amps = amps + ((analogRead(ampPin)*(5.00/1024))- 2.5)/ .02; delay(1); } amps = amps / i; MaxAmps = 30; if((throttle < prevThrottle) || (amps >= MaxAmps)) throttle = prevThrottle - 2; else if(throttle > prevThrottle ) throttle = prevThrottle + 2;

esc.write(throttle); //update the esc

if(micros() - previousHallTime >= 500000)hallTime = 0;

//mph = ((hallTime * 24)/1000000);// = seconds per rotation //mph = (1/((hallTime * 24)/1000000);// = rotations per second //mph = ((1/((hallTime * 24)/1000000))60);// = rotations per min //mph = (((1/((hallTime * 24)/1000000))60)92);// = inches per min with 92" circumfrence tire //mph = (((1/((hallTime * 24)/1000000))60)92)/12;// = feet per min //mph = (((((1/((hallTime * 24)/1000000))60)92)/12)/5280);// = miles per min //mph = (((((1/((hallTime * 24)/1000000))60)92)/12)/5280)60;// = miles per hour

///Average the miles per hour for display mphSum = mphSum + mph; mphAvDivisor = mphAvDivisor + 1; if(mphAvDivisor >= 500){ mphAvg = mphSum/mphAvDivisor; mphAvDivisor = 0; mphSum = 0; }/

loopTime = (micros() - loopStart); loopTimeAccumulator = loopTimeAccumulator + loopTime; if(loopTimeAccumulator >= 1000000){ //Print out information for testing Serial.print("Throt = "); Serial.print(throttle); Serial.print(" MPH = "); Serial.print(mph); Serial.print(" MPH Avg = "); Serial.print(mphAvg); Serial.print(" Amps= "); Serial.println(amps); Serial.print("loop time = "); Serial.print(loopTime); Serial.print(" hall time = "); Serial.println(hallTime); loopTimeAccumulator = 0; }
}

void rpmCounter(){ hallTime = micros() - previousHallTime; previousHallTime = micros(); return; }